Table 2.
Association of coffee and tea intake with RA
| Nutrient | No. of Cases | Age adjusted | Multivariable adjusted* | ||
|---|---|---|---|---|---|
| HR | 95% CI | HR | 95% CI | ||
| Total coffee, cups/day | |||||
| None | 49 | 1.00 | Referent | 1.00 | Referent |
| Any | 132 | 1.09 | (0.78, 1.51) | 1.09 | (0.77, 1.54) |
| p value | 0.62 | 0.63 | |||
|
| |||||
| Caffeinated coffee, cups/day | |||||
| None | 79 | 1.00 | Referent | 1.00 | Referent |
| Any | 105 | 1.04 | (0.77, 1.39) | 1.04 | (0.77, 1.41) |
| p value | 0.81 | 0.80 | |||
|
| |||||
| Decaffeinated coffee, cups/day | |||||
| None | 121 | 1.00 | Referent | 1.00 | Referent |
| Any | 60 | 1.03 | (0.76, 1.41) | 1.00 | (0.72, 1.37) |
| p value | 0.83 | 0.98 | |||
|
| |||||
| Unfiltered coffee†, cups/day | |||||
| None | 167 | 1.00 | Referent | 1.00 | Referent |
| Any | 12 | 0.92 | (0.51, 1.65) | 0.76 | (0.40, 1.45) |
| p value | 0.77 | 0.41 | |||
|
| |||||
| Filtered coffee‡, cups/day | |||||
| None | 61 | 1.00 | Referent | 1.00 | Referent |
| Any | 118 | 1.12 | (0.82, 1.52) | 1.18 | (0.85, 1.64) |
| p value | 0.48 | 0.32 | |||
|
| |||||
| Tea, cups/day | |||||
| None | 125 | 1.00 | Referent | 1.00 | Referent |
| Any | 56 | 1.29 | (0.94, 1.77) | 1.40 | (1.01, 1.93) |
| p value | 0.11 | 0.04 | |||
*
Adjusted for age, race/ethnicity, marital status, smoking history, alcohol use, use of hormone therapy, education, and BMI
†
Espresso + boiled + percolated + French press coffee preparation
‡
Drip + instant coffee preparation